Faller cam for gill-drawing frames



Oct. 7| I W. HOLDSWORTH FALLER CAM FOR GI ELL DRAWING FRAMES Filed Decj6, 1925 2 Shem-wheat 1 i) l X mm, by

Get. 7 1924.

W. HOLDSWORTH FALLE R CAM FOR GIL-L DRAWING FRAMES Filed Dec. 6,

2 Sheets-Sheet 2 Patented Got. 7, 1924,

tenses WILLIE HOLDSWORTH, 0F PBGVIDENCE, BHQDE ISLAND.

FALLER CAM FOR GILL-DRAWING FRAMES! Application filed. December 6, 1923. Serial No. 678,949.

To all whom it may concern:

Be it known that I, VILLIE HoLDswoR'rH, a citizen of the United States residing at Providence, in the county of Providence, State of Rhode Island, have invented certain new and useful Improvements in Faller Cams for Gill-Drawing Frames, of which the following is a specification.

This invention relates to gill-drawing frames and consists of improvements in the taller-cams for the gill-screws.

'One object of the invention is to provide a cam-member for the bottom-screw having unitary guiding-means embodied therein which acts to gnide the faller-bar' in transferring it from the bottom-screw to the top-screw, whereby to insure the proper engagement of the bar with the threads of the top-screw.

Another object of the invention to provide a gniding-meanson the faller-cam which acts to guide the faller-bar during its complete movement of transfer from one screw to the other.

Another object. of the invention is to provide a faller-cam having a guide-flange or fin adapted to pass through an opening or slot in the top-screw. which opening is made without mutilating or cutting away the threads to weaken them at any point. I

Another object of the invention-is to provide guiding-means on the faller-cam adapted for use with a top-screw in which the screw-threads are left with suflicient stock to reinforce them at their ends.

Another object of the invention is to provide guiding-means on the faller-cam which may be accommodated by cutting away the top-screw with a simple machining operation without requiring filing or handfitting of the threads.

Another object of the invention is to pro vide a faller-cam for the gill-screw which' may be constructed as a complete unit ad-ap ted to be interchangeably applied thereto so that a. broken cam may be replaced by anew one without machining. or fitting the parts. v I

Another object of the invention is to provide a 'faller-cam of stronger construction and greater durability. to resist the hard wear to which it is subjected in the machine.

' Another object of the invention is to provide a tallercam which may be attached to the gill-screw without removingor dismantling the mechanism of the gill-drawing frame. v

Further objects of'the improvement are set forth in the following specification which describes a preferred embodiment of the invention ns illustrated by the accompanying drawings. In the drawings:

Fig. 1 is a side elevation of the top-screw and bottoin-screw of a gill-drawing frame showing my improved taller-cam as applied faller bar from the bottom-screw to the top screw;

Fig. 5 is a fragmentary view of the top screw and bottom-screw showing the faller-- bar in section and illustrating it in position as it leaves the faller-cam during its traverse by the top-screw; and

Fig- 6 is a detailed perspective view of a preferred embodiment of my improved faller-cam. I

Referring first to Fig. 1 of the drawings, 1 have here shown the top-screw 2 and bottom-screw 3 of a usual type of gilldrawing frame-as journaled in end-bearings f and 5 and adapted to be rotated in oppo site directions by means of suitable gearing at their ends, indicated by the referencecharact-er 6. it will be understood that there are two sets of gill-screws arranged in opposite relation in the gill-drawing frame with the gill-bars or fallers extending therebetween and adapted to be lI-12lV-- ports or saddles, not herein shown, being traversed slowly in one direction by the top-screws 2 during their operative stroke,

Ill

and then returned in the opposite direction by the bottom-screws at a faster speed. Suitable ca na'nembers S at the ends of the top-screws 2 act on the gill-bars or tallers 7 to transfer them from the top-screws 2 to the bottom-screws 3 at the end of their traverse in one direction, and another set of cams 10 on the bottom-screws lift the bars at the completion of their return movement to engage them once more with the threads of the top-screws.

My present impr veinent relates more particularly to the taller-cams 10 "for the bottom-screw, altl'lough it is to be noted that the improvement might he applied to the cams for the top-screw if desired. Heretoi ore in the present art it has been the practice in most instances to employ tallercams with out W iding-means and to mount vertical conductors or rigid taller-guides on the irame oi": the machine for guiding the taller-bars as they are transferred from the bottom-screws to the top-screws. In other cases, the fixed conductors or taller-guides have been eliminated by tne use o t diskcams for the bo'tton'i-screws, such cams having a circular rim or disk for guiding the taller-hers in their transit from the bottomto the top-screws,this construction 01 cam being described and illustrated in my U. S. Letters Patent No. 1,113,346, dated October 1.3, 191%. The use of a dis eam such as described in the atent reicrredto is open to some objection, however, since the threads on the top-screw must be cut away at their ends to provide that the guidingliange may intersect the top-screw at a point where the taller-bars enter into engagei'nent with the threads. in tact, the threads of the top-screw must be vey materially mutilated or cut away at their ends and finished down to a sharp point, as shown in the patent above referred to. and also in my U. S. Letters Patent No. 1,329,- 90st, dated February 1920.

it will be noted by reference to that the bottom-screw 3 has a reduced shank 11 and a body portion of larger diameter in. which the tl 'eads 12- ar The threads of the botto a-screw a double pitch, cut with relatively long lead and with the grooves spaced at a relatively wide distance apart; while the upper-screw 2 has narrower threads of double pitch with less lead. It i l also he noted that the threads on he bottom-screw are not cut clear through LO the end of its enlarged portion, a substal nub or solid butt 13 be. left tor re between the threads and the sham 11. butt end of the threaded portion of the screw is slotted longitudinally on its opposite sides to provide seats or recesses 1 1 in which the cam-members 10 are held.

" lteterring now particularly to Fig.9, my

improved cam member comprises a rectangular foot or bar 15 adapted to fit into one of the slots 14 in the butt end or hub 13 of the screw and provided with holes 16 through which are inserted suitable bolts 17 for fastening the cam in place on the screw. Projecting radially outward from the foot 15 is an arm 18 formed at its end with a forwardly-projecting rounded protuberance or cam-nose 19 having a circular hearing-face 2-0 at its end. The outer peripheral edge or" the cam 10 is formed concentric with the axis of the screw on which the cam is mounted and extending torwardly from the cam-nose 19 is a lateral iange or fin 21 which constitutes the guiding-means for the taller-bar as it rides on the rounded end 20 of the cam. The outer peripheral edge of the flange or tin 21 is extended circumferentia-lly or concentric with the axis 01"- the screw, as illustrated most clearly in Fig. 3, and its forward end is rounded oil at 22 so that it assumes the shape of a finger projecting in advance of the curved face 2O 01" the cam 19. The -for- .vard end of the guide-flange 21 is pitched or inclined slightl to the left of the camnose 19, as viewed in Fig. 2, for a purpose as later explained. The rearward side of the cam-member 19 is beveled oil at 23, leaving an inclined shoulder or ledge 24 which is, in elifect, a continuation of the peripheral edge of the flange or finger 21. see Fig. 6. The beveled face 28 on the rearward side of the cam is designed to provide a clearance for the threads oi? the topscrew where the cam intersects the later as shown in Fig. 5 and explained more fully hereinafter. It will be understood that there are two cams at the rearward end of the threaded portion of the bottonr screw 3 which are arranged in opposite diametrical relation with their foot-pieces 15 secured in the slQ'ots 14: in the butt or huh of the screw.

Referring now to Figs. 1 and 2, the rearward end of the enlarged threaded portion of the top-screw 2 is formed with a butt or solid hub-portion similar to the butt 13 on the bottom-screw 3. This serves as a reinforcement for the screw-threads at their ends and stren thens and stifl'ens the screw at a point midway between its bearings where formerly it was weakest. The. cammember 10 on the bottom-screw 3 intersects the top-screw 2 at this point and the butt or solid part of the screw provides for cutting away the metal without unduly weakening the screw. It will be noted from Figs. 1 and 2, that the guiding-flange or fin 21 is offset laterally from the upper face of the cam-nose or protuberance 19 and the topscrew 2 is cutaway at 26 to providea clearwa for flange lm l br efly; n t ad of continuing thethreadinto the butt 25in a spiral or helix it is cut across at this point to form a relatively wide opening between the squared shoulder 27 and the next thread on the screw. At the sametime the thread still remains connected with the hub or butt 25 by a substantial thickness of metal which reinforces it from the but-t. It will be noted that this cut or opening 26 in the screw is made with square edges so that it may be milled out or machined away without hand work such as filing or fitting. l/Vhere the end of the thread merges into the squared portion of the cut it is beveled off on its side at 28, but only to a slight extent, to provide a clearance for the beveled side 23 of the cam projection 19. It will be seen by reference to Fig. 5 that the bevel 23 on the side of the cam provides a clearance between the cam and the side of the thread on the top-screw without narrowing the thread to any considerable extent where it merges into the butt or solid portion of the screw. As there are two cams on the bottom-screw 3 it is necessary of course to have two cut-out portions at the end of the threads of the top-screw. Fig. 2 shows the fin or flange 21 on one of the cams entering the cut-out portion 26 on the top-screw and in this view the end of the cut on the opposite side of the screw is shown at the top as designated at 29. I

The method of operation of the two screws and the manner in which my lim'prov'ed faller-cam cooperates therewith will now be explained in detail: Referring to Fig. 1 of the drawings, it has before been explained that there are two sets of top-screws 2 and bottom-screws 3 between which the fallerbars 7 extend in horizontal relation with their ends engaging the threads of the screws, but for the present purpose it will be sufficient to describe the action of the faller-cam of a single bottom-screw in' shifting the faller therefrom to the top-screw. The faller-bars or combs 7 are supported by hori zontalsaddles which are not illustrated in the present drawings in order not to obscure the showing of the screws themselves. The

top-screw 2 propels the faller-bars to'the right as viewed in Fig. 1, and as they reach the end of the screw 2 the earn 8 comesinto engagement with the top'of the fallers to carry them down into the threads of the bot tom-screw 3. During the transfer of the faller-bar from the top-screw to the bottomscrew it is guided by theend plate or hearing 5, and as its end enters'thethrea'd groove in the bottom-screw it is traversed back to the left to be once more transferred to the topscrew. As the faller-bar reaches the rear ward end of the thread groove in the bottomscrew 3 one of the cams 10 is brought around beneath it and, hearing at its rounded noseend 19 on the bottom of the bar, it acts to lift the latter as illustrated in Fig. 4-. The

lifting action of the cam 10 on the bar 7 will cause the end of the bar to enter the end of one of the thread grooves on the top-screw 2, it being noted from Fig. 1 that icomes into engagement with the bottom edge e of the faller-bar 7 its guiding-flange or fin 21 will ride up along the side of the bar to hold the latter from lateral displacement andto direct its movement to properly engage its end with the thread groove in the top-screw 2. It has been explained that the flange 21 is slightly offset or inclined to the left at its end, as viewed in Figs. 1 and 2,

and the purpose of this is to insure that the leading edge of the flange will clear the under edge of the bar so that the bar will be properly engaged by the side face of the flange. Now as the bottom-screw 3 continues to rotate in the direction indicated by the arrows in Figs. 3 and 4: the faller-bar Wlll ride off from the rounded end 20 of the camnose 19 andonto its )BIi heral ed e as indi- "cated in Fig. 3, Fig. 4: showingthe engagemerit of the cam with the'bar during the first stage of the operation of lifting the bar. As the bar is released from engagement with the guiding-flange or fin 21 it enters into complete engagement with the threads of the top-screw and the continued rotation of the bottonrscrew carries the camthrough the out or opening 26 in the top-screw 2, as

shown in Fig. 3. It will be observed from this view that thetop-screw is not cut away to a depth greater than the depth ofthe threads in the screw or, in other words, the body of the screw remains unmutilated so that the screw is not weakened at this point.

As the faller-bar 7 enters into engagement with the threads of the top-screw it is traversed to the right and eventually rides off from the outer peripheral edge of' the cam 10 as illustrated in Fig. 5. As the faller leaves the cam 10 it meets the upper edge of the saddle, not herein shown, and is supported thereby during its traverse along the threads of the top:crew. As the two screws continue to rotatethe next faller-bar traversing the threads of the bottom-screw reaches the end of the thread groove and is engaged by the OPPOSltBKZfiIlI 10 thereon whereby itis lifted intoengagement with the top-screw in the same manner as previously explained. In this way as the faller-bars reach the inner end of the threads of the bottom-screw they are each in turn lifted by one of the cams 10 and the guiding: flange 21 on the side of the cam-nose serves as a support or retainer to prevent the bars from being displaced laterally. The bars will thus be effectually guided into proper engagement with the threads of'the topscrew. In this connection it will be understood of course that the. faller-bars will also be guided on their opposite sides by the ends of the saddles across which they ride in the manner as well known to those versed in the art.

It will be observed that my present improvement provides an especially simple and eflicient guiding-means for the faller-bars which may be constructed as a part of the taller-cam at very little added expense to the cost of manufacturing the usual form of cam. My improvement provides for eliminating the extra conductors or rigid guides heretofore attached to a fixed part of the machine, and also obviates the use of the heavy cumbersome disk-cam which requires mutilation and weakening of the threads. of the top-screw.

.lVith the present improvement the cam and its guide-flange is constructed as a single unit and is therefore much lighter in weight and less combersome than the disk cams previously employed. Moreover the present form of guidingmeanson the cam is adapted to intersect the top-screw in such a way that the threads of the screw do not have to be filed down to a point and fitted by manual operations. The threads of the screw are therefore not mutilated or weakened and hence are less liable to be broken, so that the screw is made more durable un der the hard use to which it is subjected in the machine.

My improved cam may be made to standardized dimensions so as to be interchangeable to replace broken or damaged cams without machining or refitting the parts. Furthermore, the cams can be set in place and attached to the screw without removing the latter from the machine and consequently provides for a considerable saving in time and labor in making repairs and re placements.

While I have herein disclosed a preferred form of the cam and its integral guiding-flange or fin, it is obvious that the form and structure of this, part of the invention may be varied if desired, and therefore without limiting myself as to the e1- aet embodiment shown, I claim:

1. In a gill-drawing frame, the combination with the top-screw and bottom-screw thereof, of a radial cam-arm on one of the screws provided with a guidingflange offset laterally from the working-face of the cam and projecting therefrom in position to engage the side of the faller-bar to support and guide said bar as it is transferred from one screw to the other.

In a gill-drawing frame, the comhina ion with the top-screw and bottom-screw thereof, of a faller-cam on one of the screws comprising a substantially radial arm formed with a forwardly projecting camnose, and provided with a laterally 0am guiding-fin projecting in advance of the cam-nose to adapt it to engage the side of the faller-bar to guide the latter in its transit from one screw to the other.

3. In a gill-drawing frame, the combination with the top-screw and bottom-screw thereof, of a fuller-cam having a foot held in a slot in one of the screws and provided with an arm extending substantially radially therefrom with a forwardly projecting cam-nose at its end, and a lateral guiding flange extending circumferentially in advance of the working-face of the cam to adapt it to abut the side of the faller-bar I as, the latter is transferred from one screw to the other by the cam.

i. In a gill-drawing frame, the combination with the top-screw and bottom-screw thereof, of a faller-cam 0n the bottom-screw comprising an arm formed with a forward-- ly projecting cam-nose provided with a laterally offset guiding-flange the topscrew being cut away on its circumference without thinning the threads of the screw to provide an opening for the passage of the guiding-flange therethrough as the screws are oppositely rotated.

In a gill-drawing frame, the combination with the bottom-screw thereof, of a faller-cam on said screw comprising a radial arm formed with a forwardly projecting camnose having a lateral guiding-flan projecting circumferentially in advanre thereof, and a top-screw having helical threads merging into a substantial hub or cylindrical reinforcing butt at their ends, said butt cutthrough on its circumference without materially reducing the cross-sectional area of the threads to provide an opening for the passage of the guiding flange to adapt the cam to intersect the threads of the top-screw.

6. An improved'faller-cam for gill-screws comprising a foot for attachment to the screw, and an arm Xtending from said foot and formed with a forwardly projecting cam-nosehaving a lateral guiding flange offset from its side and projecting in vance of its working face to adapt it to abut the. side of the faller-bar as the latter rides on. the cam.

In testimony whereof I aliiX my signa ture.

WILLIE HOLDSNORTH. 

